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Hi Midhun, there are two ways to specify subnets - inline (as you have above) and the recommended way, as standalone resources that reference the virtual network: <https://www.pulumi.com/docs/reference/pkg/azure/network/subnet/>
As standalone resources, you can refer to them from other code.

don't forget that if you're using the subnet resource standalone, then you must run `pulumi up -r` (refresh) every time from then on, otherwise Azure ARM will try to delete your subnets.